Power-feed device

Abstract

Disclosed is a vehicle charging system that includes a plurality of primary self-resonance coils provided on a road side and a plurality of secondary self-resonance coils provided on a vehicle. Power is fed from the primary self-resonance coils to the secondary self-resonance coils. Each primary self-resonance coil has a different resonance frequency from the adjacent primary self-resonance coils. Each secondary self-resonance coil has a different resonance frequency from the adjacent secondary self-resonance coils.

1 . A power-transmitting device comprising:
 a plurality of primary coils which transmit electric power to a mobile unit in a non-contacting manner, wherein
 the plurality of primary coils include a plurality of first coils having a predetermined resonance frequency and a plurality of second coils having another resonance frequency different from that of the first coils, and 
 the first coil and the second coil are alternately placed in a predetermined direction. 
   
     
     
         2 . The power-transmitting device according to  claim 1 , wherein
 the predetermined direction is a direction of movement of the mobile unit.   
     
     
         3 . The power-transmitting device according to  claim 1 , wherein
 the plurality of primary coils are arranged in one line along the predetermined direction.   
     
     
         4 . The power-transmitting device according to  claim 1 , wherein
 the first coil and the second coil have one or more of a radius, a length in an axial direction, and a number of windings different from each other.   
     
     
         5 . The power-transmitting device according to  claim 1 , wherein
 capacitors having different capacitances from each other are connected to the first coil and the second coil.   
     
     
         6 . A mobile unit comprising:
 a plurality of secondary coils which receive electric power from a power-transmitting device in a non-contacting manner, wherein
 the plurality of secondary coils include a plurality of third coils having a predetermined resonance frequency and a plurality of fourth coils having another resonance frequency different from that of the third coil, and 
 the third coil and the fourth coil are alternately placed in a predetermined direction. 
   
     
     
         7 . The mobile unit according to  claim 6 , wherein
 the predetermined direction is a direction in which the mobile unit moves.   
     
     
         8 . The mobile unit according to  claim 6 , wherein
 the plurality of secondary coils are arranged in one line along the predetermined direction.   
     
     
         9 . The mobile unit according to  claim 6 , wherein
 the third coil and the fourth coil have one or more of a radius, a length in an axial direction, and a number of windings different from each other.   
     
     
         10 . The mobile unit according to  claim 6 , wherein
 capacitors having different capacitances from each other are connected to the third coil and the fourth coil.   
     
     
         11 . A power-feed device which transmits electric power from a power-transmitting device to a mobile unit in a non-contacting manner, wherein
 the power-transmitting device includes a plurality of first coils having a predetermined resonance frequency and a plurality of second coils having another resonance frequency different from that of the first coils,   the mobile unit includes a plurality of third coils having a predetermined resonance frequency and a plurality of fourth coils having another resonance frequency different from that of the third coils,   the first coil and the second coil are alternately placed in a predetermined direction, and   the third coil and the fourth coil are alternately placed in a predetermined direction.   
     
     
         12 . The power-feed device according to  claim 11 , wherein
 the predetermined direction in which the first coil and the second coil are placed and the predetermined direction in which the third coil and the fourth coil are placed are a direction in which the mobile unit moves.   
     
     
         13 . The power-feed device according to  claim 11 , wherein
 the plurality of primary coils are arranged in one line along the predetermined direction, and   the plurality of secondary coils are arranged in one line along the predetermined direction.   
     
     
         14 . The power-feed device according to  claim 11 , wherein
 the first coil and the second coil have one or more of a radius, a length in an axial direction, and a number of windings different from each other, and   the third coil and the fourth coil have one or more of a radius, a length in an axial direction, and a number of windings different from each other.   
     
     
         15 . The power-feed device according to  claim 11 , wherein
 capacitors having different capacitances from each other are connected to the first coil and the second coil, and   capacitors having different capacitances from each other are connected to the third coil and the fourth coil.